To Delete rates cause maybe you need to narrow down the list or there are others similarly added, you can do so by following these steps:
1. On the Left-Hand Menu go to Rates, and click Rate Groups.
2. List of Rate Groups will populate on the right, just find that rate group where the rates you want to remove belong to and click 'Show'.
3. On the list of rates in that group, find that Rate and click on Edit.
4. Next is the Rate's details page, scroll down to the bottom and you'll see a Delete button. Press on it and then click Okay on the pop-up box on top to confirm.